Gaspump said: (quoted from post at 13:36:43 12/12/09) Don't have to. I have done several with the JB only to soon repair it again. When the manifold is removed with JB repairs you will have some dust falling off with the gasket and the repaired pits will be clearly visible. The Thermo will be just as when you installed the manifold or even better as it seems to continue to harden and even look more like the block metal. As you can see I am not a big fan of JB, it is great in many applications but especially not for block pits. I get all the JB products from one of our sponsors and I have tried them all as recommended. There are at least 6-7 different JB welds, you may have used something other on your block pits than the original or their Hi-Temp as I have, there is no comparison to the Thermo results.
Based on your results, I would assume you did a poor job on the prep. Had my manifold off last year to do a valve clean up and the JB was as good as when I put it on.
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